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Thank you, Caleb Dueck, for that.  It just shows my ignorance of basic electronics :unsure:   I guess I will have to buy some scrap wire

as the longest length, I would need is 16 feet (but that's gotta be cheaper than ripping the cables from the walls)

I bought the basic multi-meter from your link and I need to learn how to use it :whistle:

Thanks again for your help XD